Cotton thread is subject to dry rotting over time as well, so test all thread before using it. Pull out a length and break it off using your hands. If it breaks easily, the thread is dry rotted and should be thrown away. If it takes a fair amount of effort to break it, it is still good and can be used.
A friend of mine turned me on to using Gutermann thread. It's expensive as thread goes, but with sales and coupons it becomes no more expensive than the other stuff normally is.
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Cotton thread is subject to dry rotting over time as well, so test all thread before using it. Pull out a length and break it off using your hands. If it breaks easily, the thread is dry rotted and should be thrown away. If it takes a fair amount of effort to break it, it is still good and can be used.
A friend of mine turned me on to using Gutermann thread. It's expensive as thread goes, but with sales and coupons it becomes no more expensive than the other stuff normally is.